Why sodium silicate powder can buffer the alkalinity of laundry soap?
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Author : Lzh
Update time : 2023-02-16 15:24:25
What is sodium silicate powder? The molecular formula ofsodium silicate(also known as sodium silicate) is Na2O.nSiO2 · xH2O. The properties of sodium silicate vary with the molecule's ratio of silica and sodium oxide. This ratio is called modulus. When the modulus is more than 3, it is called neutral sodium silicate; when the modulus is less than 3, it is called alkaline sodium silicate. The shape of sodium silicate is solid and liquid, and the commodity is more common. The shape of liquid sodium silicate is a colorless, grayish, reddish transparent, or translucent viscous liquid; It is soluble in water. The sodium silicate aqueous solution has viscosity, especially the high viscosity of high modulus. It decomposes and precipitates colloidal precipitation of silicic acid when it meets with acid. Solid sodium silicate is a sky blue or yellow-green glassy substance whose relative density increases with modulus decrease. There is no fixed melting point. It can be used as a concrete accelerator and waterproof agent.
Classification of sodium silicate There are two kinds of sodium silicate: sodium metasilicate, chemical formula Na2SiO3, with formula weight 122.00. Sodium metasilicate is also known as "disodium trisilicate," CAS No. 6834-92-0. The other is sodium orthosilicate (sodium orthosilicate), the chemical formula Na4SiO4, with a relative molecular weight of 184.04. Sodium orthosilicate is a rare colorless crystal melting point of 1361K (1088 ℃). Water glass solution is alkaline due to hydrolysis (slightly stronger than soda ash). Because it is a weak acid salt, it meets hydrochloric acid, sulfuric acid, and nitric acid; Carbon dioxide can precipitate silicic acid. During storage, carbon dioxide should be prevented from entering, and rubber plugs should be used to prevent sticking to ground glass plugs.
Preparation of sodium silicate powder Na2CO3+SiO2 → Na2SiO3+CO2 ↑ is commonly used in industry to produce Na2CO3+SiO2 → Na2SiO3+CO2 ↑. The products are often light blue-green because of containing ferrous salts. They are used as inorganic bonding agents (can be mixed and shared with talcum powder, etc.), soap fillers, and acid-resistant concrete. After adding pigments, they can be used as coating materials for exterior walls and poured into the foundation soil of ancient buildings to make the soil firm to prevent collapse. Sodium metasilicate is a low-molecular crystal made from Chemicalbook by the hydrothermal reaction of common foamed soda and caustic soda; the commodities include anhydrous, pentahydrate, and nine-hydrate, of which nine-hydrate only exists in the market of China. It is a low-tech emergency product hastily developed in the 1980s in need of sodium metasilicate. Because its melting point is only 42 ℃, it is easy to change into liquid or paste when stored and is being phased out. However, due to some user habits and some fields are not very concerned about crystal water, sodium metasilicate nine-hydrate still has a certain market.
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